Might there be some way to gather data relating to user speed in AutoCAD.
Sorry, there is nothing built in. You can maybe adjust this sample application to suit? http://adndevblog.typepad.com/autocad/2012/06/autocad-performance-gauges-app.html
Being that we're in a LISP forum, methinks tayloring the .NET, WPF (XAML) code-behind for your plug-in might be over the head of some LISP-ers.
I still feel that more information is needed to assist the OP in their request, but to otherwise point out a prudent starting point, one might consider a simple Command (and other?) Reactor(s) which writes to a custom log file (or dictionary?).
"How we think determines what we do, and what we do determines what we get."